I-valve yokumisa isetshenziswa kakhulu ukulawula nokumisa uketshezi olugeleza ngepayipi. Ahlukile kuma-valve afana nama-ball valve nama-gate valve ngoba aklanyelwe ngqo ukulawula ukugeleza koketshezi futhi awagcini nje ngezinsizakalo zokuvala. Isizathu sokuthi i-stop valve iqanjwe kanjalo ukuthi umklamo omdala uveza umzimba othile oyindilinga futhi ungahlukaniswa ngama-hemispheres amabili, ahlukaniswe yi-equator, lapho ukugeleza kushintsha khona indlela. Izinto zangaphakathi zangempela zesihlalo sokuvala ngokuvamile aziyindilinga (isb., ama-ball valve) kodwa ngokuvamile anjenge-planar, hemispherical, noma i-plug shape. Ama-globe valve avimbela ukugeleza koketshezi kakhulu uma evulekile kunama-gate noma ama-ball valve, okuholela ekwehleni kokucindezela okuphezulu kuwo. Ama-globe valve anezimo ezintathu zomzimba eziyinhloko, ezinye zazo ezisetshenziselwa ukunciphisa ukwehla kokucindezela nge-valve. Ukuze uthole ulwazi ngamanye ama-valve, sicela ubheke kuMhlahlandlela wethu womthengi wama-valve.

Umklamo wevalvu

I-valve yokumisa yakhiwe izingxenye ezintathu eziyinhloko:umzimba wevalvu nesihlalo, idiski yevalvu kanye nesiqu, ukupakisha kanye nebhonethi. Lapho usebenza, zungezisa isiqu esinentambo nge-actuator yesandla noma i-valve ukuze uphakamise idiski yevalvu esihlalweni sevalvu. Indlela yoketshezi edlula kuvalvu inendlela efana no-Z ukuze uketshezi lukwazi ukuxhumana nekhanda lediski yevalvu. Lokhu kuhlukile kumavalvu esango lapho uketshezi luqonde khona esangweni. Lokhu kulungiselelwa ngezinye izikhathi kuchazwa njengomzimba wevalvu ofana no-Z noma ivalvu enobunjwa obungu-T. I-inlet kanye ne-outlet zihambisana.

Ezinye izilungiselelo zifaka ama-engeli namaphethini anomumo we-Y. Ku-valve yokuma kwe-angle, indawo yokukhipha ingu-90 ° ukusuka endaweni yokungenisa, futhi uketshezi lugeleza endleleni enomumo we-L. Ekulungiselelweni komzimba we-valve enomumo we-Y noma we-Y, isiqu se-valve singena emzimbeni we-valve ku-45 °, kuyilapho indawo yokungenisa kanye nendawo yokukhipha ihlala isemgqeni, kufana nakwimodi yezindlela ezintathu. Ukumelana kwephethini ye-angular ukugeleza kuncane kunokwephethini enomumo we-T, futhi ukumelana kwephethini enomumo we-Y kuncane. Ama-valve anezindlela ezintathu avame kakhulu kulezi zinhlobo ezintathu.

Idiski yokuvala ivame ukuncishiswa ukuze ilingane nesihlalo sevalvu, kodwa idiski eyisicaba nayo ingasetshenziswa. Uma ivalvu ivuliwe kancane, uketshezi lugeleza ngokulinganayo nxazonke kwediski, kanye nokusatshalaliswa kokuguguleka esihlalweni sevalvu kanye nediski. Ngakho-ke, ivalvu isebenza kahle lapho ukugeleza kuncishisiwe. Ngokuvamile, isiqondiso sokugeleza sibheke ohlangothini lwesiqu sevalvu sevalvu, kodwa endaweni eshisa kakhulu (umusi), lapho umzimba wevalvu uphola futhi uncipha, ukugeleza kuvame ukubuyela emuva ukuze kugcinwe idiski yevalvu ivalwe kahle. Ivalvu ingalungisa isiqondiso sokugeleza ukuze isebenzise ingcindezi ukusiza ukuvala (ukugeleza ngaphezu kwediski) noma ukuvula (ukugeleza ngaphansi kwediski), ngaleyo ndlela ivumele ivalvu ukuthi yehluleke ukuvala noma yehluleke ukuvula.

Idiski noma ipulaki yokuvalaivame ukuqondiswa phansi esihlalweni se-valve ngekheji ukuqinisekisa ukuthintana okufanele, ikakhulukazi ekusetshenzisweni komfutho ophezulu. Eminye imiklamo isebenzisa isihlalo se-valve, futhi uphawu ohlangothini lwenduku ye-valve lokucindezela kwe-disc luhlala eduze kwesihlalo se-valve ukuze kukhishwe ingcindezi ekupakishweni lapho i-valve ivuliwe ngokugcwele.

Ngokomklamo wento yokuvala, ivalvu yokuma ingavulwa ngokushesha ngokujika okuningana kwesiqu sevalvu ukuze kuqalwe ngokushesha ukugeleza (noma ivalwe ukuze kumiswe ukugeleza), noma ivulwe kancane kancane ngokujika okuningana kwesiqu sevalvu ukuze kukhiqizwe ukugeleza okulawulwayo okwengeziwe ngevalvu. Nakuba amaplagi ngezinye izikhathi asetshenziswa njengezinto zokuvala, akufanele adidaniswe namavalvu eplagi, okuyizinto zokujika kwekota, ezifana namavalvu ebhola, asebenzisa amaplagi esikhundleni samabhola ukuze amise futhi aqale ukugeleza.

isicelo

Amavalvu okumisa asetshenziselwa ukuvala nokulawula izikhungo zokuhlanza amanzi angcolile, izikhungo zikagesi kanye nezikhungo zokucubungula. Asetshenziswa kumapayipi omusi, izifunda zokupholisa, izinhlelo zokugcoba, njll., lapho ukulawula inani loketshezi oludlula kumavalvu kudlala indima ebalulekile.

Ukukhethwa kwezinto zomzimba we-globe valve kuvame ukuba yinsimbi ephothiwe noma ithusi/ithusi ekusetshenzisweni okuphansi kokucindezela, kanye nensimbi yekhabhoni eyenziwe noma insimbi engagqwali ekucindezelweni okuphezulu nasekushiseni. Izinto ezicacisiwe zomzimba we-valve zivame ukufaka zonke izingxenye zokucindezela, futhi "ukusika" kubhekisela ezingxenyeni ezingezona umzimba we-valve, kufaka phakathi isihlalo se-valve, idiski kanye nesiqu. Usayizi omkhulu unqunywa yikilasi lokucindezela lekilasi le-ASME, futhi amabhawodi ajwayelekile noma ama-flange okushisela aya-odiwe. Ukulinganisa ama-globe valve kudinga umzamo omkhulu kunokulinganisa ezinye izinhlobo zama-valve ngoba ukwehla kokucindezela kulo lonke i-valve kungaba yinkinga.

Ukwakheka kwesiqu esikhuphukayo kuvame kakhulu kuma-valve okumisa, kodwa ama-valve esiqu angakhuphuki nawo angatholakala. Ibhonethi ivame ukuboshwa futhi ingasuswa kalula ngesikhathi sokuhlolwa kwangaphakathi kwevalvu. Isihlalo sevalvu nediski kulula ukukushintsha.

Amavalvu okumisangokuvamile zenzeka ngokuzenzakalelayo kusetshenziswa i-pneumatic piston noma ama-diaphragm actuators, asebenza ngqo esiqwini se-valve ukuhambisa idiski endaweni yayo. I-piston/diaphragm ingancishiswa ukuvula noma ukuvala i-valve uma ilahlekelwa umfutho womoya. Kusetshenziswa ne-electric rotary actuator.